Research

One of the most talked-about frontiers in keto research is the brain, and specifically serious mental illness. The idea has a logic to it: conditions like bipolar disorder may involve problems with how brain cells produce and use energy, and ketones offer the brain an alternative, steady fuel. A 2024 pilot study from Stanford put that idea to a careful first test. The study Shebani Sethi and colleagues at Stanford Medicine, publishing in Psychiatry Research, ran a pilot trial in 21 adults who had either bipolar disorder or schizophrenia and were already taking antipsychotic medication, all of whom also had signs of metabolic trouble such as weight gain or raised blood sugar, which these medications commonly cause.

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Most people meet keto as a weight-loss diet, but that is not where it came from. The ketogenic diet was developed in the 1920s as a treatment for epilepsy, and it has been used for that ever since, long before anyone thought of it for the waistline. That history matters, because epilepsy is the one area where the evidence for keto is not new or tentative but decades deep. Why it started with seizures A seizure is, very loosely, a storm of excess electrical activity in the brain.

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The most common worry about keto, and a fair one, is the heart. A diet built on fat sounds like it ought to be bad for cholesterol and blood vessels, and plenty of people are told exactly that. So it is worth looking at what the trial evidence actually shows rather than what either side asserts. A 2022 meta-analysis is a good place to start, because it pooled a lot of trials and looked specifically at heart risk factors.

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Migraine is more than a bad headache, and anyone who gets them knows how disruptive they are. One of the more intriguing corners of keto research looks at the brain rather than the waistline, and asks whether running the brain partly on ketones rather than glucose can make migraines less frequent. A 2024 study adds some real, if early, evidence. Why the brain angle makes sense There is a reasonable theory behind it.

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Polycystic ovary syndrome affects a great many women, and one of its central threads is insulin resistance: the body struggles to handle carbohydrate efficiently, insulin runs high, and that in turn nudges the ovaries to produce more male-type hormones than they should. Because a ketogenic diet directly lowers the carbohydrate the body has to deal with, researchers have wondered whether it might help with PCOS specifically. A 2024 review gives the most useful answer so far.

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Of all the reasons people try a ketogenic diet, blood sugar is one of the best studied. Type 2 diabetes is, at its heart, a problem with how the body handles carbohydrate, so it makes intuitive sense that eating far less of it would help. The good news is that this is not just intuition. There is a sizeable body of trial evidence, and in 2025 researchers pulled much of it together in one place.

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